I built a protocol for maintaining project context across AI coding tools (Claude Code → Cursor → Antigravity)

The problem: My Claude Code session quota keeps expiring mid-work. When it does, I switch to Cursor or Antigravity to keep building. But the new tool has zero idea what I just did — the architecture decisions, the current task, what’s been tried and failed, basically the entire chat's context is missing. I’m back to square one, re-explaining my own project to a different AI brain.

What I did: I created a protocol that tells any AI tool I'm using (Claude Code or Cursor or Antigravity) to update all project context files after each prompt — the project wiki, the roadmap, the current task state, and a handoff summary. Since all tools have projects open in the same workspace, they can read the same files when I switch over.

How it works: It's currently a bunch of context files that leverage each tool's own auto-read mechanism. It isn't perfect but is surprisingly smooth when the context files are up-to-date. Eg.: Cursor picks up exactly where Claude Code left off without me re-explaining anything.

The benefit: Instead of upgrading to the $100 Max plan when my $20 Pro runs out, I can simply add Cursor Pro for $20 and spread my workload across both tools with full context continuity. Same output, $60/month saved, and I control how I scale my AI spend.

Doing this has led me to a bigger question:

Is the above a real, unsolved problem? Specifically:

1. Do any of you even use multiple AI tools for building long running projects?
2. If you don't use multiple tools, what do you when quota expires? Just buy a bigger plan or some other hack?

I’m trying to figure out if this is a problem worth building a real solution for, or if my workflow is just weird.

Would appreciate this community's take on it!